In order to achieve a higher precision, the DPS310 will read the sensor multiple times ( oversampling ), and

combine the readings into one result. This increases the current consumption and also the measurement time,

reducing the maximum possible measurement rate. It is necessary to balance the accuracy and data rate

required for each application with the allowable current consumption.

The measurement precision, rate and time is set in the Pressure Configuration (PRS_CFG) and Temperature

Configuration(TMP_CFG) registers. The register descriptions contain information about the current

consumption and the possible combinations of measurement precision, time, and rate.

Enabling temperature measurements allows for compensation of temperature drift in the pressure

measurement. The rates of these measurements can be set independently, but temperature compensation is

more accurate when temperature and pressure measurements are taken together. This reduces the maximum

Measurement Settings and Use Case Examples contains a table with examples of combinations of pressure

and temperature precision and rates for different use cases.

In the figure below is described the Temperature and Pressure measurements sequence in background mode.

Figure 5

Background mode temperature and pressure measurements sequence

4.5

Sensor Interface

- The sensor's default interface.

- The sensor's address is 0x77 (default) or 0x76 (if the SDO pin is pulled-down to GND).

• SPI interface

- The sensor will switch to SPI configuration if it detects an active low on the CSB pin. SPI 4-wire is the

default SPI interface.

- To enable SPI 3-wire configuration, a bit must be set in the Interrupt and FIFO configuration (CFG_REG)

register after start up.

More details about digital interfaces are available in the Digital interfaces.

4.6

Interrupt

The DPS310 can generate an interrupt when a new measurement result is available and/or when the FIFO is full.

The sensor uses the SDO pin for the interrupt signal, and interrupt is therefore not supported if the interface is 4-

wire SPI.

configuration the SDO pin serves as both interrupt and as the least significant bit in the device address. If the

SDO pin is pulled low the interrupt polarity must be set to active high and vice-versa.

The interrupt status can be read from the Interrupt Status (INT_STS) register.

DPS310 - Digital Pressure Sensor

Digital Barometric Pressure Sensor for Portable Devices

Functional Description

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V1.0

2016-09-05